Useless box

– Servo (I used cheap Chinese servo from ebay – you can get one for as little as 2$ with free shipping)

– limit switch

– 2AA battery holder

– some wires

– PCB laminate

– Glue gun

– solder

I got electronic parts from local DIY shop for 5PLN total.

First thing is to reassemble the wooden box so that the hinges are on the other side (the box should open lengthwise instead of width wise). Then cut the lid so that both parts are separated. The lid should be cut with less angle so that it closes freely.

Next you need to do is to remove electronics from servo, and limiting pin as well if it exists. The end product should be servo with two wires connected straight to motor.

Next you need to wire things together. It is really not that hard – and nice exercise. The end goal is to have servo rotating in one direction until limit switch is pressed and when ON-ON switch is switched the servo should start turning in other direction that’s it really.

Actually the most tricky part is to attach servo to the box, and construct the arm so that it will open the box and turn the switch. After few failed prototypes made out of cardboard you should get it right. The final piece is made of PCB laminate.

At the end just attach the ON-ON switch to the box and your useless box is ready!